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c011401 |
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subroutine exp1(l,u,n)
C Input: n is number of iterations
C Output: l,u are such that
C l(1)/l(2) < exp(1) < u(1)/u(2)
C
Cf2py integer*4 :: n = 1
Cf2py intent(out) l,u
integer*4 n,i
real*8 l(2),u(2),t,t1,t2,t3,t4
l(2) = 1
l(1) = 0
u(2) = 0
u(1) = 1
do 10 i=0,n
t1 = 4 + 32*(1+i)*i
t2 = 11 + (40+32*i)*i
t3 = 3 + (24+32*i)*i
t4 = 8 + 32*(1+i)*i
t = u(1)
u(1) = l(1)*t1 + t*t2
l(1) = l(1)*t3 + t*t4
t = u(2)
u(2) = l(2)*t1 + t*t2
l(2) = l(2)*t3 + t*t4
10 continue
end
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